MMM-RemoteControl or vcgencmd Issue

[Stroke 0]

I’m using a Raspberry Pi 4 Model B Rev 1.2 for my mirror. In attempting to shut off the hdmi to the mirror using both MMM-RemoteControl, or a bash file using vcgencmd display_power 0/1, the monitor turns back on within 12 seconds. Research indicates that it’s due to kernel control on the P1 4 model. Oddly, no one in the forum seems to be experiencing this. Any suggestions or tips that I can employ? Thank you.

[sdetweil]

@Stroke-0 my pi4 doesn’t have an issue

off command is
(sudo /usr/bin/vcgencmd display_power 0) >/dev/null
on command is
(sudo /usr/bin/vcgencmd display_power 1) >/dev/null

commands issued over ssh

[OberfragGER]

This post is deleted!

[OberfragGER]

@Stroke-0 No Problems here. Im using MMM-RemoteControl and a PI4. I also use MMM-NewPir to turn the Monitor off.

[bdeelman]

@Stroke-0

A (or my) Rpi4 has two HDMI ports. So you should add also the HDMI port 0 or 1 (or id 2 and id 7). docs

Status screen:

vcgencmd display_power -1 2 | grep -q "1" && echo "on" || echo "off"
vcgencmd display_power -1 7 | grep -q "1" && echo "on" || echo "off"

Regards,
Bert

[MiPraSo]

I had the same issue, I use MMM-PIR-Sensor-Lite to switch the monitor off and on again. On the command line “vcgencmd display_power 0” does not work, the return is always: “display_power=1”.

I have tried a few things, they all did not work.
Edit the “config.txt” in the “/boot” directory.

Go to:

“# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2”

And change “dtoverlay=vc4-kms-v3d” to “dtoverlay=vc4-fkms-v3d”.

There is a bug in the “vc4-kms-v3d” driver.

After changing in the “config.txt” “vcgencmd display_power 0” returns a “display_power=0”.

MMM-PIR-Sensor-Lite now works as desired.

[Stroke 0]

@MiPraSo Well done! Thank you. Your solution works perfectly. I do not understand why others are not experiencing the same issue however, they now have a solution. Thank you, again.

[sdetweil]

@OberfragGER do you have it set for cec-client mode? it does all 4 approaches

[OberfragGER]

@sdetweil I dont have any proble with CEC e.g…? Or do you just mistakenly quotet me…?

[sdetweil]

@OberfragGER no, I was just asking how you used NEW-Pir

[OberfragGER]

@sdetweil I just use the Standard setting in my config.js.
Standard = use vgencmd

https://wiki.bugsounet.fr/en/EXT-Screen

[sdetweil]

@OberfragGER we have discovered that some pi firmware (updated under the covers by some kernel updates) causes the vcgencmd to not work,

https://forum.magicmirror.builders/topic/17185/pir-sensor-problem-after-restart-raspi/20?_=1663206370580

[grena]

Ongoing fix! More information in my last post ;-)

[OberfragGER]

@sdetweil Thanks for your info.
I assume that i have an working firmware. I dont have any clue which version this is.

[sdetweil]

@OberfragGER right, the latest update broken then command

do this from a terminal window

rpi-update b976c54917e240630c05a9b383010f1492bc61b4

[magmar]

@MiPraSo Thank you! Worked like a charm :)

To be allowed to save the config.txt-file, I had to edit it in administrator-mode (sudo nano config.txt). I also had to reboot the Pi after saving the file.